Blocklist Checker Check if your domain is on a blocklist

The Blocklist Check Tool, also known as a blacklist check tool, allows you to verify if your mail server’s IP address is on any DNS-based blacklists. Being on a blacklist can prevent your server from sending email effectively, as some recipients may reject or mark your messages as spam.

IP addresses are commonly blacklisted if they have been associated with spam activity, insecure mail servers, or compromised accounts. Sometimes, shared servers can lead to blacklisting if other users on the same server IP send unsolicited messages. Regularly checking your server's blacklist status can help you maintain a good email reputation.

DNS-based blacklists (DNSBLs) maintain lists of IP addresses known or suspected to send spam. When a mail server tries to send an email, the recipient’s server checks the sender's IP address against these lists. If the IP is on a blacklist, the email may be blocked or sent to the spam folder. This tool helps you identify your DNS-based blacklist status.

If your IP address is blacklisted, you can often request removal from the blacklist. First, identify the reason for the listing and resolve any issues, such as securing your mail server or reviewing outgoing email practices. Then, visit the blacklist provider’s site to submit a delisting request. Regular blacklist checks can prevent recurring issues.

Being blacklisted impacts your email delivery by reducing the likelihood of successful inbox placement. Many mail servers reject or flag emails from blacklisted IPs, which means recipients may not receive your messages. Regularly using a blacklist check tool helps ensure your IP’s reputation remains clear, maintaining effective email communication.

The Blocklist Check Tool allows you to manually check your server IP address against popular DNS-based blacklists. While it doesn’t run automatic checks, regularly using this tool can help you monitor your blacklist status and ensure your mail server's reputation remains intact.